Question

calcule a soma dos infinitos termos da P.G.(45,15,5,...)

Answer 1

Sn=a1/(1-q)
a1=45
q=15/45=1/3
q=5/15=1/3

Sn=45/(1-1/3)
Sn=45/(3/3-1/3)
Sn=45/2/3
Sn=45.3/2
Sn=135/2
Sn=67,5